Climate: 7 questions on 2 degrees – CNN

Climate: 7 questions on 2 degreesCNNHumans never have lived on a planet that's 2 degrees Celsius (3.6 Fahrenheit) warmer than it was before we started burning fossil fuels, in the late 1800s, and climate experts say we risk fundamentally changing life on this planet if we do cross that 2 …and more »